SCHEDULE 13D/A

Arcellx Inc

Common Stock $0.001 par value per share · CUSIP: 03940C100

Event date: 2025-05-08

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• New Enterprise Associates 15, L.P.Reported CIK 0001629794

  Shares: 3,745,262.00 · Class: 6.8%

• NEA Partners 15, L.P.Reported CIK 0001640031

  Shares: 3,745,262.00 · Class: 6.8%

• NEA 15 GP, LLCReported CIK 0001640033

  Shares: 3,745,262.00 · Class: 6.8%

• Forest BaskettReported CIK 0001277631

  Shares: 3,745,262.00 · Class: 6.8%

• Anthony A. Florence, Jr.Reported CIK 0001559827

  Shares: 3,745,262.00 · Class: 6.8%

• Mohamad H. MakhzoumiReported CIK 0001630226

  Shares: 3,745,262.00 · Class: 6.8%

• Scott D. SandellReported CIK 0001237289

  Shares: 3,745,262.00 · Class: 6.8%

• Peter W. SonsiniReported CIK 0001559807

  Shares: 0.00 · Class: 0%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.